Static and dynamic properties of random magnets. [MnF/sub 2/, FeF/sub 2/ diluted with ZnF/sub 2/]

Conference · Wed Jan 01 04:00:00 EST 1986

OSTI ID:5143811

Birgeneau, R J; Cowley, R A; Uemura, Y J

A series of neutron scattering experiments were performed on model random magnetic systems - specifically, transition metal fluorides such as MnF/sub 2/ and FeF/sub 2/ diluted with the nonmagnetic isomorph ZnF/sub 2/. This paper reviews briefly results on the phase transition behavior of diluted magnets. We also discuss in detail the nature of the excitations. In Mn/sub 0.5/Zn/sub 0.5/F/sub 2/ a dramatic crossover from propagating to localized spin waves is observed as one goes from long to short wave lengths. This is discussed in the context of the ''fracton'' picture of excitations in percolation networks.

• Research Organization: Massachusetts Inst. of Tech., Cambridge (USA). Dept. of Physics; Edinburgh Univ. (UK). Dept. of Physics; Brookhaven National Lab., Upton, NY (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5143811
• Report Number(s): BNL-38534; CONF-861207-3; ON: DE87001380
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
BEAMS
FLUORIDES
FLUORINE COMPOUNDS
HALIDES
HALOGEN COMPOUNDS
INELASTIC SCATTERING
IRON COMPOUNDS
IRON FLUORIDES
MANGANESE COMPOUNDS
MANGANESE FLUORIDES
MANGANESE HALIDES
NEUTRON BEAMS
NUCLEON BEAMS
PARTICLE BEAMS
SCATTERING
SPIN WAVES
TRANSITION ELEMENT COMPOUNDS
ZINC COMPOUNDS
ZINC FLUORIDES
ZINC HALIDES